feat(range): Range.len()

src/builtin/range.zig

@@ -14,7 +14,7 @@ pub fn toList(ctx: *obj.NativeCtx) c_int {
                 },
             ) catch @panic("Could not instanciate list"),
         ),
-    ) catch @panic("Could not instanceiate range");
+    ) catch @panic("Could not instanciate range");
 
     ctx.vm.push(Value.fromObj(list.toObj()));
 
@@ -32,3 +32,18 @@ pub fn toList(ctx: *obj.NativeCtx) c_int {
 
     return 1;
 }
+
+pub fn len(ctx: *obj.NativeCtx) c_int {
+    const range = ctx.vm.peek(0).obj().access(obj.ObjRange, .Range, ctx.vm.gc).?;
+
+    ctx.vm.push(
+        Value.fromInteger(
+            if (range.low < range.high)
+                range.high - range.low
+            else
+                range.low - range.high,
+        ),
+    );
+
+    return 1;
+}

src/obj.zig

@@ -2493,13 +2493,15 @@ pub const ObjRange = struct {
         NativeFn,
         .{
             .{ "toList", buzz_builtin.range.toList },
+            .{ "len", buzz_builtin.range.len },
         },
     );
 
     const members_typedef = std.ComptimeStringMap(
         []const u8,
         .{
             .{ "toList", "extern Function toList() > [int]" },
+            .{ "len", "extern Function len() > int" },
         },
     );
 

tests/053-range.buzz

@@ -16,6 +16,8 @@ test "Range" {
         sum = sum + n;
     }
     std.assert(sum == 45, message: "Could iterate over range");
+
+    std.assert(rg.len() == 10);
 }
 
 test "Inverted range" {
@@ -33,4 +35,6 @@ test "Inverted range" {
         sum = sum + n;
     }
     std.assert(sum == 55, message: "Could iterate over inverted range");
+
+    std.assert(rg.len() == 10);
 }